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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f0d0bdb05f33311bcd582cb0fcd9a38aa9db3d6ee569fbc94a076ad2a3e230' 
  AND token = 'uZxj2RNSXmqkaWEQ8bOmMTFZQl4Vj5IjzgPRKIau6iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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