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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87257aaed87ad27074e780268c9b6b89610ad7f0a4683e6879a0bad77c8fb0e6' 
  AND token = 'XrTf8TKWJOfpPLngqku6vl0xpF7+D7TVUzxBw4aG5/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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