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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae7f23fe4ea142eeec19356cbe0aec34cc8d5c987fe0c3ad49dc013ab7e8283' 
  AND token = 'fT/9rVxy26l0NEga/hNxr2DvOsHa/IUlq+pERXMUnKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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