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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65b2a61bfaed3727516bbbb85deaac8490c58d6f37ba41851d8cf0d540847e9' 
  AND token = '/T6q2AHOQ1CFnqzh8s+du2IkmKnmDxZJL9+f1PqzANc=' 
  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"
    }
  }
}