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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc13e40eeb9fd8549bf2fc55328ba22c5b673b9195ec14ef915ba21bc1c8501' 
  AND token = '2UCIUhhfent6be3L12CK7J5J1n9xUL247/Kbe1Elj1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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