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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95dac01769f5c38ee57e147d1bda1804b25eebfe23c44a86bfb4dc34b22e106' 
  AND token = '0+2onIHB1MpU1ULbt6p27X++Teys1hkyCPFdxHVz1mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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