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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922fa4289e82370e660a69e10ebd34ec39c5d104f67befece015469943708f82' 
  AND token = '2mmClJpV47W5NVdD0AWYn+1F01x8ouApTKmC5TsYMAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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