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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0c246760fcbe66ad5ab73ec3b2e47d54637d14bb459f94434fb4a47d8c0bab' 
  AND token = 'mOcHSRGTRE7jvXsZxKgt3vd1PKz+VR+6cb+pkprtrMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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