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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cad0fa555bc764ef47b8d616f9f4c53e0c356c7460200e164b049738ddd8bb' 
  AND token = 'U4PhNkNeHOli+Oe7IIvdyfHfDyXRXRp8tQM6Sf57D7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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