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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45aacc826e7ea205471e97ba73756a9b01af7cdf082eaa15e6da6ac084577397' 
  AND token = 'Jgo5KZo8ETmt7VRo8HS20Swp31Y6jFKdB+YGnp2ViqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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