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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ffea43c7a0d9d640bd9a96df3749a5d4f44195aa1e625d69e1c8b11b3d7ba0' 
  AND token = 'FBrSQxhfH+NDxcMcHsKGdlYzTCL2BHZ1g/PIbtQJ5I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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