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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5e22b6851a65cacd31880e7d756d5320f0e0bca936c3048a5f0f2ebead4bf9' 
  AND token = 'jcb50OQwB7z6d0lk6Khg/XAnblyDP7FCe9u3oEYY44c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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