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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87dc4d98065bd657c63cffe67507063a2daa2a8a7c237682cac03a2c99eefcd' 
  AND token = 'alC/fNrQW5jnU1t5UMb9GB2Z/ddu2bWQ4fs+pyLhUVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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