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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1d15574263c3bbbcce8f2e14be5ebb2c07c0c3a5b9318e02e49b41c4f17c53' 
  AND token = 'H+O+Mjlo4NjWWIn2DeTKLAA7R0ePNpTeYn9l+fBe1qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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