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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7edb25e9ccd2a28c49bacbbd31505071c73ca1163f4725259189b8ba191e8519' 
  AND token = 'VPpAAj8vxmBe/Q5y9BAk9pLDT4AdyC1OfbP1gGO1fTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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