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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2fa5867a1b8bc1f8c3d332e7b3303eaf88d4f29109ca6a6d716afde2e346d1' 
  AND token = 'AN1oC7ykm+I4aK28pVe6kJUMWvTuE6IJSU5ZCG8MAiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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