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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5fa703e2872b0d9a6305ebb04ccf3e2ae36879de87ddf0e1d1d99288a89e7c' 
  AND token = '7ruaFQv6uSamiZvZcnX/GuVH4WOfxzRWJDpy6NeZERQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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