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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b0fdabdb41d513d5e831eea10d28702363b30e79498fd5d79487312e16c549' 
  AND token = 'u2tbAJ6QK/a3yrXF281Ku35E1Fn8bEfUdEix0uYHE2c=' 
  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"
    }
  }
}