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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb08bcc119a209d34b1de0b3724c3b00f4197b2c5de3fda09735974bcc7b741' 
  AND token = '6X58UwAXb3zW3QASDSb83B17G/kOwhGYTG+o4xsAKFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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