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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc31f91a2380f6f6c13d433e9cda37eaef7a83059df48e5a9779aa77d18e9f73' 
  AND token = '5+JPmmP2J08vOmq5HfiFQV03W9H4RKO2o3AerlymMzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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