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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5939d8085e6b4daeabfe440ee3f8c7e02585ba82a9a0f957be306dcc7798b4a8' 
  AND token = 'ZyZq7P7d5xe5I35Gz7G1cMfmski3yCN2rialgGlsH5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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