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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76920a05107407b0422431c6431671a59dbd3dad10c1f7d92dce1dfc0b63bae2' 
  AND token = 'jd6I3cazMJSqI/QeIZ2I6IrgS1mrBs5qLHAMK4n3w2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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