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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c229fd5ca7888ee54b56e1fcaa5467212791a2b2084b1f61e30bf76800fe9e41' 
  AND token = '3Zzwcr1EfCy15SuI+40LjYxE6uNovrQ5apeSAAmcNzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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