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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fbdffe69ff05642851fd8bfc16b125620545e46e370453e30d7aca2fdaaad20' 
  AND token = 'YQKKehr1A8CVKxASZ9Tv0+Ef1cs6fnrBvJvZa15wHZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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