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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77cd2840a26a5eebcec75864b79ca29c3227b3bc6ef58e9c5a9a1259848e625' 
  AND token = 'tNJQmQubCsXhRp+hwNry3ptEp0tmr9QkYR4Fc7rzVIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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