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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f11277bd1fa312d51e1dfb524608d17511c4a61af7f263a73aeb70c45b75e40' 
  AND token = 'h5Jn+sS8SuTEmGFm6KZrY1GXgW8VE3O3pdfrm4v3+Zo=' 
  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"
    }
  }
}