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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059b2881d1702dacfa3e206d61f1301a40a298213f00cf3842702c7c0b594e32' 
  AND token = 'epN2tJwTdcYu4ZmUQVM4XSLlQAFMNgtfpIVM0Gl9xL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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