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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2420d3a91131ec5043f23249549bcc0608f29e09bcb6fe8988bd0a7d5aa6f31' 
  AND token = 'v9YS4jlfEHOcy5fnhnGuC2MzJ18RlG2RnWUNXM8/p88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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