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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136438f73183b4496d81b393e1c0e33cf190128b7212e4838aa49e3a004bdc69' 
  AND token = '42rIKGoQ51snyUNxN4SGsAyMUZ8s6aIhmKvDjmlguBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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