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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37178de9fe28f756db26d0f8e711f8de8efb3fb1fd2470ba15cd00af99c3c5c8' 
  AND token = '2qbrUKrnregR8TO4LcnscZs3E1KR7dZ4W1EQ32ic7/w=' 
  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"
    }
  }
}