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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4ee0ef05be7443e10e0e9ea1fe501b697f2daacafbb9112d8eea2097b7f429' 
  AND token = 'u6PkPTo3ahHJ9eEYvxToroVS3rVV9S1dlAYCcGmQV1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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