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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8aadf5412652cab650ab41f73d2a3f0d28e9877e6e333c62e55433cd04c68a4' 
  AND token = '8NbkSx88EY4hqvSLGLsmTRNkgrkyKBwllbpsYmMHKS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}