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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3573ca6f159622c5bca75540e50975c74c941f336dd3f5230a90c1f87f5e97ba' 
  AND token = 'dmMT8JuBkKxO6vVFHrd82yXR02Zmfm7gjdSOO8QWcuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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